Duality in the creep rupture of a polycrystalline alumina

Journal Article · Thu Oct 31 23:00:00 EST 1985 · J. Am. Ceram. Soc.; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1985.tb16158.x· OSTI ID:6085840

Dalgleish, B J; Evans, A G; Slamovich, E B

Creep rupture experiments performed on a polycrystalline alumina have revealed a duality in fracture behavior associated with a crack blunting threshold. At high stresses, or in the presence of large preexisting flaws, fracture is dictated by the slow creep growth of flaws and exhibits substantial statistical variability. At lower stresses, preexisting flaws blunt, and failure is delayed. In this regime, failure occurs by the coalescence of creep damage, manifested as shear bands, and the failure strain becomes inversely dependent on the applied stress.

• Research Organization: Center for Advanced Materials, Lawrence Berkeley Laboratory, and Department of Materials Science and Mineral Engineering, University of California, Berkeley, CA
• OSTI ID: 6085840
• Journal Information: J. Am. Ceram. Soc.; (United States), Journal Name: J. Am. Ceram. Soc.; (United States) Vol. 68:11; ISSN JACTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
COALESCENCE
CRACK PROPAGATION
CREEP
CRYSTALS
DESTRUCTIVE TESTING
FAILURES
FRACTURE PROPERTIES
MATERIALS TESTING
MECHANICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
POLYCRYSTALS
RUPTURES
SHEAR
STRAINS
STRESS ANALYSIS
STRESS INTENSITY FACTORS
TESTING